'decking it has two meanings:
to simply deck it is to fall over randomly, often faceplanting
however 'decking' it is falling over 'with' someone of the oposit sex , i.e on stairs,the floor, against a wall
"The service, as usual, wasn't up to par at the local Red Lobster. To show my unapproval, with the manager and the hot jailbait hostess watching I decided to go deep sea decking on my way out. That'll show them not to serve me cold cheddar bay biscuits."